J/A+A/685/A29 Small bodies multiwalength phase curves (Alvarez-Candal, 2024)
The multiwavelength phase curves of small bodies. Phase coloring.
Alvarez-Candal A.
<Astron. Astrophys. 685, A29 (2024)>
=2024A&A...685A..29A 2024A&A...685A..29A (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Colors ; Magnitudes, absolute ; Photometry, ugriz
Keywords: methods: data analysis - catalogs - minor planets, asteroids: general
Abstract:
Small bodies change their brightness due to different motives:
Rotation along their axis or axes, combined with irregular shapes
and/or changing surface properties, or changes in the geometry of
observations. In this work, we tackle the problem of Phase curves,
which show the change in brightness due to changes in the fraction of
illuminated surface as seen by the observer.
We aim to study the effect of the phase curves in the five wavelengths
of the Sloan Digital Sky Survey in scores of objects (several tens of
thousands), focusing particularly on the spectral slopes and the
colors and their changes with phase angle.
We used a Bayesian inference method and Monte Carlo techniques to
retrieve the absolute magnitudes in five wavelengths, using the
results to study the phase coloring effect in different bins of the
semi-major axis.
We obtained absolute magnitudes in the five filters for over 40000
objects. Although some outliers are identified, most of the usual
color-color space is recovered by the data presented. We also detect a
dual behavior in the spectral slopes, with a change at α∼5deg.
Description:
Phase curves parameters for >100k minor bodies in the ugriz systems
plus Jhonson's V and R (obtained from transforming g, r and i
magnitudes). For each objects are given the absolute magnitudes and
phase coefficients, their respective uncertainty intervals, and the
minimum phase angle and total span in phase angle. Two denominations
are provided: The one from the input catalog (Sergeyev and Carry,
2021A&A...652A..59S 2021A&A...652A..59S, Cat. J/A+A/652/A59) and from the Minor Planets
Center, whenever available.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
pc-moc-2.dat 519 119206 Absolute magnitudes and phase coefficients
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See also:
B/astorb : Orbits of Minor Planets (Bowell+, 2014-)
J/A+A/652/A59 : SDSS Solar System Objects (Sergeyev+, 2021)
J/A+A/657/A80 : Asteroids phase curves using SLOAN MOC (Alvarez-Candal+, 2022)
Byte-by-byte Description of file: pc-moc-2.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Object Catalog Designation of the minor body
17- 25 A9 --- MPC Minor Planets Center designation
26- 33 F8.5 mag Hu ?=-8 Absolute magnitude in the u filter
37- 44 F8.5 mag B_Hu ?=-8 Absolute magnitude in the u filter at 84%
48- 55 F8.5 mag b_Hu ?=-8 Absolute magnitude in the u filter at 16%
58- 59 I2 --- Nu Number of observation in the u filter
62- 69 F8.5 mag Hg ?=-8 Absolute magnitude in the g filter
73- 80 F8.5 mag B_Hg ?=-8 Absolute magnitude in the g filter at 84%
84- 91 F8.5 mag b_Hg ?=-8 Absolute magnitude in the g filter at 16%
94- 95 I2 --- Ng Number of observation in the g filter
98-105 F8.5 mag Hr ?=-8 Absolute magnitude in the r filter
109-116 F8.5 mag B_Hr ?=-8 Absolute magnitude in the r filter at 84%
120-127 F8.5 mag b_Hr ?=-8 Absolute magnitude in the r filter at 16%
130-131 I2 --- Nr Number of observation in the r filter
134-141 F8.5 mag Hi ?=-8 Absolute magnitude in the i filter
145-152 F8.5 mag B_Hi ?=-8 Absolute magnitude in the i filter at 84%
156-163 F8.5 mag b_Hi ?=-8 Absolute magnitude in the i filter at 16%
166-167 I2 --- Ni Number of observation in the i filter
170-177 F8.5 mag Hz ?=-8 Absolute magnitude in the z filter
181-188 F8.5 mag B_Hz ?=-8 Absolute magnitude in the z filter at 84%
192-199 F8.5 mag b_Hz ?=-8 Absolute magnitude in the z filter at 16%
202-203 I2 --- Nz Number of observation in the z filter
206-213 F8.5 mag HV ?=-8 Absolute magnitude in the V filter
217-224 F8.5 mag B_HV ?=-8 Absolute magnitude in the V filter at 84%
228-235 F8.5 mag b_HV ?=-8 Absolute magnitude in the V filter at 16%
238-239 I2 --- NV Number of observation in the V filter
242-249 F8.5 mag HR ?=-8 Absolute magnitude in the R filter
253-260 F8.5 mag B_HR ?=-8 Absolute magnitude in the R filter at 84%
264-271 F8.5 mag b_HR ?=-8 Absolute magnitude in the R filter at 16%
274-275 I2 --- NR Number of observation in the R filter
278-285 F8.5 --- Gu ?=-8 Phase coefficient in the u filter
289-296 F8.5 --- b_Gu ?=-8 Phase coefficient in the u filter at 16%
300-307 F8.5 --- B_Gu ?=-8 Phase coefficient in the u filter at 84%
311-318 F8.5 --- Gg ?=-8 Phase coefficient in the g filter
322-329 F8.5 --- b_Gg ?=-8 Phase coefficient in the g filter at 16%
333-340 F8.5 --- B_Gg ?=-8 Phase coefficient in the g filter at 84%
344-351 F8.5 --- Gr ?=-8 Phase coefficient in the r filter
355-362 F8.5 --- b_Gr ?=-8 Phase coefficient in the r filter at 16%
366-373 F8.5 --- B_Gr ?=-8 Phase coefficient in the r filter at 84%
377-384 F8.5 --- Gi ?=-8 Phase coefficient in the i filter
388-395 F8.5 --- b_Gi ?=-8 Phase coefficient in the i filter at 16%
399-406 F8.5 --- B_Gi ?=-8 Phase coefficient in the i filter at 84%
410-417 F8.5 --- Gz ?=-8 Phase coefficient in the z filter
421-428 F8.5 --- b_Gz ?=-8 Phase coefficient in the z filter at 16%
432-439 F8.5 --- B_Gz ?=-8 Phase coefficient in the z filter at 84%
443-450 F8.5 --- GV ?=-8 Phase coefficient in the V filter
454-461 F8.5 --- b_GV ?=-8 Phase coefficient in the V filter at 16%
465-472 F8.5 --- B_GV ?=-8 Phase coefficient in the V filter at 84%
476-483 F8.5 --- GR ?=-8 Phase coefficient in the R filter
487-494 F8.5 --- b_GR ?=-8 Phase coefficient in the R filter at 16%
498-505 F8.5 --- B_GR ?=-8 Phase coefficient in the R filter at 84%
508-512 F5.2 deg am Minimum phase angle
514-518 F5.2 deg Da Range of phase angle covered
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Acknowledgements:
Alvaro Alvarez-Candal, varobes(at)gmail.com
(End) Alvaro Alvarez-Candal [IAA, Spain], Patricia Vannier [CDS] 21-Feb-2024